Hi wells,
No, it should'nt be at all necssary or even advisable to boost the core voltage to run at stock speed.The only reason you would boost core voltage is to gain stability when trying to overclock the chip.It may however be necessary to flash the BIOS to the latest rev in order for it to properly recognize the CPU,although if you purchased the Mobo and CPU as a unit you might think they would have done this already. The manual for your Mobo is available from the Abit site (dont have the URL handy,sorry) and that would be real helpful and a good place to start.
What settings are you using in the CPU SoftMenuII section of the BIOS. You should try using the User Define option then setting up all the parameters manually if it wont ID the chip properly with the default setup. Maik had a similar problem with his PIII 700(read his post below) and it turned out to be a bad RAM module. Are you positive that its actually PC100 RAM?
Get the manual, read it and try to determine that you have a recent BIOS rev and the right RAM and then post back and we'll try to get this straightened out. Good luck!
kbman